Chuck for tubniktcr elliptical cylinders



UNITED sTATEs P. S'. CAHOON .AND Si. F. vROSS, OF LA. GRANGE, AMISSOURI.

CHUCK FOR TURNING ELLIPTICAL CYLINDER/S.

Specification of Letters Patent No. 12,180, dated January 2 1855.

To all whom t may concern:

Be it kno-wn that we, PULAsxI S. CAHooN and SAMUEL F.v Ross, of La Grange in the county of Lewis and State .of Missouri,

have invented a new and useful 1mpr`ove` ment in Oval-Turning Lathe-i;4 Aand we dov hereby declare that the followingI is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure 1, is an end elevation of our improved lathe. Fig. 2, is a side view, showing the same partly in section and partly in elevation. In this view a spoke is shown turned. Fig. 3, is a plan or top view. Fig. 4, is a vertical transverse section through the line y, in Figs. 2 and 3. This View illustrates plainly the operation of the lathe; a spoke being shown turned.

This improvement relates to lathes for turning spokes and other articles of oval shape, and is designed to simplify their construction, and render them more utile and perfect in their operation.

The nature of said improvement consists in providing the face plate of the spindle with a sliding box or rest for one end of th'e wood, while being turned, to tit in, and so combining the same with a sliding standard, that its axis can be moved with great facility out of line with the axis of the spindle or made to stand eccentric thereto; and the axis of the wood, assit revolves, made to describe an oval instead of a circle, and t-he wood consequently, as it comes in contact with a stationary cutter, to be reduced and shaped to the form of a spoke.-

To enable others skilledv in the art to make and use our invention, we will proceed to describe its construction and operation.

A, B, represent the ordinary turning lathe.

C, is the face plate of the spindle B.

D, is a groove cut directly across the center of the same, and extending from one edge of the face plate to the other.

E, is a slide fitted in the groove Dg-this slidev is provided with a box or socket a, at the `center of its length for the article being turned to tit in, as shown in Fig. 2; it is also rovided with two lips b.

'F, is tlie sliding standard bywhich the box a, is moved eccentric to the spindle B.

This standard is secured to .the frame A, of the lathe by a dovetail d, and is made to slide back and forth horizontally, by the screw e, shown clearly in Fig. 1.

f, 1s a circular hole cutin the standard F; the axis of this hole always stands in .the same horizontal line with the axis of the spindle, no matter to .what extent it stands eccentric to the same.

f, is a ring or lanch cast around the hole on the back side of the standard F. This ring or anch serves for the lips b, Z), of the slide E, to lap over and move around as the spindle revolves, as will be evident from the drawing, It is by mea-ns of this ianch and the lips, that the slide E, is combined with the standard, and that the standard is enabled, when moved to the right or left to effect the desiredchange in the relative positions of the axes of the slide and spindle with one another.

The operation is as follows The stick of wood to be turned is secured in the box a, as shown in red in Fig. 2. The screw e is turned, and standard and ring moved horizontally, until it assumes the position shown in black in Fig. 3, and in blue in Fig. 1, or

suliciently out of center with the lathe spindle to give the required oval shape to the stick of wood. By moving the standard as Just stated, the slide is caused to assume the position shown in red in Fig. 4, and the wood to stand eccentric to the lathe spindle, and concentric (before the operation commences) with the hole f, of the standard,

All being properly arranged, the workman sets the spindle in motion, and adjusts and guides his cutter as the operation proceeds. As the spindle, with its faceplate,

revolves, it carries the slide and box with it,

and owing to the ring of ange f', to which the slide is connected by the lips b, b, being eccentric to the axis of the spindle, the axis of the slide is caused gradually to change its position, and in doing so, to describe a small oval asillustrated by small circles in Fig. 4, and the wood consequently, as it comes in contact with the cutter, to be reduced and shaped to the form of a spoke as shownvn Fig. 4.

By having 'the axis of the slide stand very eccentric to the spindle, the major axis of the oval will be lengthened, and'the minor axis shortenedgand vice versa, by having the axis of the slide stand but slightly eccentric to the spindle.

By arranging the slide E, between the face plate and the sliding standard F, instead of attaching it to an adjustable'ring arranged on the front support of the lathe spindle, which is back of the face plate, .its box a, will be supported and steadied at the same time that it is guided, and Very little chance for it and the spindle to vibrate, allowed. In oval turning lathes now used, owing to the slide not having any other support besides the frontbearing of the spindle, it is caused, as the spindle vibrates,to Valso change its position to a considerable extent, and thus render the lathe imperfect in its operation.

set forth. Y

PULASKI S. CAI-ICON. SAMUEL F. ROSS. Witnesses:

WM. HAGooD, V. M. SMITH. 

